/* JAI-Ext - OpenSource Java Advanced Image Extensions Library
 *    http://www.geo-solutions.it/
 *    Copyright 2018 GeoSolutions
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 *  Copyright (c) 2011, Michael Bedward. All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without modification,
 *  are permitted provided that the following conditions are met:
 *
 *  - Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 *  - Redistributions in binary form must reproduce the above copyright notice, this
 *    list of conditions and the following disclaimer in the documentation and/or
 *    other materials provided with the distribution.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 *  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 *  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 *  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.eclipse.imagen.media.jiffle.runtime;

import org.junit.Test;

/**
 * Unit tests for if-else statements.
 *
 * @author Michael Bedward
 * @since 0.1
 * @version $Id$
 */
public class IfElseTest extends RuntimeTestBase {

    @Test
    public void ifWithExpression() throws Exception {
        System.out.println("   if statement with simple expression");
        String script = String.format("z = 0; \n" + "if (src > %d) z = 1; \n" + "dest = z;", NUM_PIXELS / 2);

        Evaluator e = new Evaluator() {
            public double eval(double val) {
                return (val > NUM_PIXELS / 2 ? 1.0 : 0.0);
            }
        };

        testScript(script, e);
    }

    @Test
    public void ifWithBlock() throws Exception {
        System.out.println("   if statement with block");
        String script = String.format(
                "z = 0; \n" + "if (src > %d) { \n" + "  z = src; \n" + "  z = z * z; \n" + "}\n" + "dest = z;",
                NUM_PIXELS / 2);

        Evaluator e = new Evaluator() {
            public double eval(double val) {
                return (val > NUM_PIXELS / 2 ? (val * val) : 0.0);
            }
        };

        testScript(script, e);
    }

    @Test
    public void ifElseWithExpression() throws Exception {
        System.out.println("   if-else statement with simple expressions");
        String script = String.format(
                "z = 0; \n" + "if (src < %d) \n" + "  z = 1; \n" + "else \n" + "  z = 2; \n" + "dest = z;",
                NUM_PIXELS / 2);

        Evaluator e = new Evaluator() {
            public double eval(double val) {
                return (val < NUM_PIXELS / 2 ? 1.0 : 2.0);
            }
        };

        testScript(script, e);
    }

    @Test
    public void ifElseWithBlocks() throws Exception {
        System.out.println("   if-else statement with blocks");
        String script = String.format(
                "z = 0; \n"
                        + "if (src < %d) { \n"
                        + "  z = src; \n"
                        + "  z = 2 * z; \n"
                        + "} \n"
                        + "else { \n"
                        + "  z = src; \n"
                        + "  z = 4 * z; \n"
                        + "} \n"
                        + "dest = z;",
                NUM_PIXELS / 2);

        Evaluator e = new Evaluator() {
            public double eval(double val) {
                return (val < NUM_PIXELS / 2 ? 2 * val : 4 * val);
            }
        };

        testScript(script, e);
    }

    @Test
    public void nestedIf() throws Exception {
        System.out.println("   nested if statement");
        String script = String.format(
                "z = 0; \n"
                        + "if (src < %d) { \n"
                        + "  if (src < %d)"
                        + "     z = 1; \n"
                        + "  else \n"
                        + "     z = 2;"
                        + "}"
                        + "dest = z;",
                NUM_PIXELS / 2, NUM_PIXELS / 4);

        Evaluator e = new Evaluator() {
            public double eval(double val) {
                return (val < NUM_PIXELS / 4 ? 1 : (val < NUM_PIXELS / 2) ? 2 : 0);
            }
        };

        testScript(script, e);
    }

    @Test
    public void ifTreatsNullAsFalse() throws Exception {
        System.out.println("   if statement treats null as false");
        String script = "val = con(src % 2, 1, null); \n" + "if (val) dest = 1; \n" + "else dest = 0;";

        Evaluator e = new Evaluator() {
            public double eval(double val) {
                if (((int) val) % 2 == 1) {
                    return 1;
                } else {
                    return 0;
                }
            }
        };

        testScript(script, e);
    }
}
